The overhead press is one of my better lifts (200x2 yesterday, 185x5 a few weeks ago).
I don’t really have anything to back up my answer, but my intuition would be to not change the reps of your bench/incline press while you run the intensification block for your overhead press. I recently switched from almost half a year of sets of five to a cycles of triples, doubles, and singles, and all my accessories are being done in the same range (sets of eight on DB benching, for example)
However,
This gives me some pause about whether you even need to worry about accumulation/intensification yet. My first question would be how much you weigh?